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Copy pathGameEventBus.cpp
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126 lines (108 loc) · 3.7 KB
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#include "stdafx.h"
#include "GameEventBus.h"
void GameEventBus::ClearEvents()
{
mEventQueue.clear();
mEventQueueBuffer.clear();
}
void GameEventBus::Send_ReturnToFrontendRequest()
{
GameEvent& ev = mEventQueue.emplace_back(eGameEvent_ReturnToFrontendRequest);
}
void GameEventBus::Send_StartScenarioRequest(const std::string& scenarioName)
{
GameEvent& ev = mEventQueue.emplace_back(eGameEvent_StartScenarioRequest);
ev.mStartScenarioRequest.mScenarioName = scenarioName;
}
void GameEventBus::Send_QuitGameRequest()
{
GameEvent& ev = mEventQueue.emplace_back(eGameEvent_QuitGameRequest);
}
void GameEventBus::Send_ResourceAmountChanged(ePlayerID playerId, eGameResource resourceType)
{
// discard if duplicate
if (cxx::contains_if(mEventQueue, [playerId, resourceType](const GameEvent& gameEvent)
{
return gameEvent.IsEvent(eGameEvent_ResourceAmountChanged) &&
(gameEvent.mResourceAmountChanged.mResourceType == resourceType) &&
(gameEvent.mPlayerId == playerId);
}))
{
return;
}
GameEvent& ev = mEventQueue.emplace_back(eGameEvent_ResourceAmountChanged);
ev.mResourceAmountChanged.mResourceType = resourceType;
ev.mPlayerId = playerId;
}
void GameEventBus::DispatchEvents()
{
if (mEventQueue.empty()) return;
mEventQueueBuffer.clear();
std::swap(mEventQueueBuffer, mEventQueue);
for (const GameEvent& ev: mEventQueueBuffer)
{
std::vector<GameEventListener*>& subscriptions = mSubscriptions[ev.mEventId];
// using indexing instead of range-for for stability
for (size_t i = 0; i < subscriptions.size(); ++i)
{
GameEventListener* listener = subscriptions[i];
if (listener == nullptr)
continue;
listener->HandleGameEvent(ev);
}
}
}
void GameEventBus::Subscribe(eGameEvent eventID, GameEventListener* listener)
{
if ((listener == nullptr) ||
(eventID == eGameEvent_Null) ||
(eventID >= eGameEvent_COUNT))
{
cxx_assert(false);
return;
}
std::vector<GameEventListener*>& subscriptions = mSubscriptions[eventID];
if (cxx::contains(subscriptions, listener))
return;
int reusePlaceIndex = cxx::get_first_index_if(subscriptions, [](GameEventListener* ptr) { return ptr == nullptr; });
if (reusePlaceIndex != -1)
{
cxx_assert(subscriptions[reusePlaceIndex] == nullptr); // sanity check
subscriptions[reusePlaceIndex] = listener;
}
else
{
subscriptions.push_back(listener);
}
}
void GameEventBus::Unsubscribe(eGameEvent eventID, GameEventListener* listener)
{
if ((listener == nullptr) ||
(eventID == eGameEvent_Null) ||
(eventID >= eGameEvent_COUNT))
{
cxx_assert(false);
return;
}
std::vector<GameEventListener*>& subscriptions = mSubscriptions[eventID];
int placeIndex = cxx::get_item_index(subscriptions, listener);
if (placeIndex != -1)
{
cxx_assert(subscriptions[placeIndex] == listener); // sanity check
subscriptions[placeIndex] = nullptr;
}
}
void GameEventBus::Unsubscribe(GameEventListener* listener)
{
cxx_assert(listener);
if (listener == nullptr) return;
for (std::vector<GameEventListener*>& subscriptions: mSubscriptions)
{
int placeIndex = cxx::get_item_index(subscriptions, listener);
if (placeIndex != -1)
{
cxx_assert(subscriptions[placeIndex] == listener); // sanity check
subscriptions[placeIndex] = nullptr;
}
}
}